Fix platform_FilePerms.

We need to account for the new /var/run/debugfs_gpu bind mount point.

BUG=None
TEST=Passes on lumpy.

Change-Id: I9fb130444d839b5a9ae6eaf717beb21acdae9452
Previous-Reviewed-on: https://gerrit.chromium.org/gerrit/43539
(cherry picked from commit 244da8948b944acc7e9ce0eb9eb8b67e8e7afd9f)
Reviewed-on: https://gerrit.chromium.org/gerrit/43561
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: James Cook <jamescook@chromium.org>
1 file changed